@SWSVIC what ppm is coming out and are u measuring the 500 or 700 standard.
@Aang if u have the blue lab Ec meter…just calibrate yourself and take reading periodically. You can inform the support team at Grobo if your Rez EC is running high and prevent issues before u see it on the leaves. EC can range from 1-2 and anything higher , I would keep a closer eye on. The most important thing is how your plants looks